Sum of Resistance in Parallel Circuits

Published by Werdna in
arraysloopsmathphysics

If two or more resistors are connected in parallel, the overall resistance of the circuit reduces. It is possible to calculate the total resistance of a parallel circuit by using this formula:

1/RTotal = 1/R1 + 1/R2 + 1/R3 ...

Create a function that takes an array of parallel resistance values, and calculates the total resistance of the circuit.

Worked Example

parallelResistance([6, 3, 6]) ➞ 1.5

// 1/RTotal = 1/6 + 1/3 + 1/6
// 1/RTotal = 2/3
// RTotal = 3/2 = 1.5

Examples

parallelResistance([6, 3]) ➞ 2

parallelResistance([10, 20, 10]) ➞ 4

parallelResistance([500, 500, 500]) ➞ 166.7
// Round to the nearest decimal place

Notes

  • Note that you should rearrange to return the Resistance Total, not 1 / Resistance Total.
  • Round to the nearest decimal place.
  • All inputs will be valid.
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